Building a Generic Login Page

kali · by **kali** » Tue Jun 02, 2009 7:42 am

hello pogz
i got error at statement:

showAlert("Crap!", "Couldn't find the 'txt_username' or 'txt_password' "

the error is :

The method showAlert(String, String, String, boolean) is undefined for the type new View.OnClickListener(){}

pls help me.

jana · by **jana** » Wed Aug 05, 2009 7:35 am

Hi Guys ,

I'm making a login page for my application.
I need to check the login username and password against the database

i have total 4classes
loginform(usname ---------
password -------
login register )
register(it consists of some text and edit fields and also one button(save)
after user enter all fileds ,when he clicks save button ,it will store in database)
main
Dbclass

i created all the above classes and coded ui part and also databse creation

when user first time means , he will register first and then by checking username and password he will login

but all these fields r in database
how to store them dynamically
and how to retrieve and update and delete the records
pls send the code for this application
my mailid is vuruvakilinaidu@gmail.com

thanks and regards
janardhan

jana · by **jana** » Wed Aug 05, 2009 7:39 am

Hi Guys ,

I'm making a login page for my application.
I need to check the login username and password against the database

i have total 4classes
loginform(usname ---------
password -------
login register )
register(it consists of some text and edit fields and also one button(save)
after user enter all fileds ,when he clicks save button ,it will store in database)
main
Dbclass

i created all the above classes and coded ui part and also databse creation

when user first time means , he will register first and then by checking username and password he will login

but all these fields r in database
how to store them dynamically
and how to retrieve and update and delete the records
pls send the code for this application
my mailid is vuruvakilinaidu@gmail.com

thanks and regards
janardhan

plusminus wrote:Hey pogz,

you do that with the following BB-Tags-Style:
Syntax: [ Download ] [ Hide ]
Syntax: [ Download ] [ Show ]
Using xml Syntax Highlighting
[ syntax = " language " ] YOUR_CODE [ / syntax ]

where language == java or language == xml or most other languages...

Parsed in 0.000 seconds, using GeSHi 1.0.8.4

Yes you are right, I will do a posting-guide or a kinda 'template' tomorrow

Regards,
plusminus

jmf · by **jmf** » Thu Jan 28, 2010 12:01 am

@kali - I got the same error as that. I right clicked it and used the show fix option.

In order to get the program to run and compile it also suggested I change 'EditText id="@+id/txt_password"' to 'EditText android:id="@+id/txt_password"'.

I did this to all instances and it now compiles and runs but nothing happens when you hit the login button.

I'm kind of fumbling around in the dark really and am not sure of what I'm doing...anyone know why the login button wouldn't be doing anything?

mohammed.gouse · by **mohammed.gouse** » Mon Apr 05, 2010 9:28 am

venkat wrote:Hi cybersat,
you may be forgot to update the main.xml file here.
just copy main.xml file above and past it in your main.xml file . it will be in inside the res-->layout.
i have attached full project here. have a look.

regards,
venkat

[font=Arial Black] [/font]

Sivan · by **Sivan** » Mon Jul 12, 2010 5:29 pm

Hi pogz...

Nice tutorial, I really liked it , but there is 1 prob
The layout is perfect but the java coding has a problem

When I run the application on the Emulator, Its running but when i click Login its doing nothing......

This is your Code:
________________________________________________________________________________________

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

package pogz.test;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
 
/**
 *  Application Name: <span class="posthilit">Generic</span> <span class="posthilit">Login</span> Screen for the Android Platform (back end)
 *  Description: This is <span class="posthilit">a</span> <span class="posthilit">generic</span> <span class="posthilit">login</span> screen which catches the username and password values
 *  Created on: November 23, 2007
 *  Created by: Pogz Ortile
 *  Contact: pogz(at)redhat(dot)polarhome(dot)com
 *  Notes: The string values for username and password are assigned to sUserName and sPassword respectively
 *              You are free to distribute, modify, and wreck for all I care. GPL ya!
 * */
 
public class PogzTest01 extends Activity {
    /** Called when the activity is first created. */
    @Override
   
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
       
        // load up the layout
        setContentView(R.layout.main);
       
        // get the button resource in the xml file and assign it to <span class="posthilit">a</span> local variable of type Button
        Button launch = (Button)findViewById(R.id.login_button);
       
        // this is the action listener
        launch.setOnClickListener( new OnClickListener()
        {
               
                public void onClick(View viewParam)
                {
                        // this gets the resources in the xml file and assigns it to <span class="posthilit">a</span> local variable of type EditText
                EditText usernameEditText = (EditText) findViewById(R.id.txt_username);
                EditText passwordEditText = (EditText) findViewById(R.id.txt_password);
               
                // the getText() gets the current value of the text box
                // the toString() converts the value to String data type
                // then assigns it to <span class="posthilit">a</span> variable of type String
                String sUserName = usernameEditText.getText().toString();
                String sPassword = passwordEditText.getText().toString();
                       
                // this just catches the error if the program cant locate the GUI stuff
                if(usernameEditText == null || passwordEditText == null){
                    showAlert("Crap!", "Couldn't find the 'txt_username' or 'txt_password' "
                              + "EditView in main.xml", "Oh shit!", false);
                }else{
                        // display the username and the password in string format
                        showAlert("Logging in", "Username: " + sUserName + "nPassword: " + sPassword , "Ok", true);
                        }
                }
        }
       
        ); // end of launch.setOnclickListener
    }
}
Parsed in 0.038 seconds,  using GeSHi 1.0.8.4

__________________________________________________________________________________________________

And this is my code :

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

package com.android.hello;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.os.Bundle;
 
public class Android extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
   
        Button launch = (Button)findViewById(R.id.widget33);
        
        // this is the action listener
        launch.setOnClickListener( new OnClickListener()
        {
               
                public void onClick(View viewParam)
                {
                        // this gets the resources in the xml file and assigns it to a local variable of type EditText
                EditText usernameEditText = (EditText) findViewById(R.id.widget29);
                EditText passwordEditText = (EditText) findViewById(R.id.widget30);
               
                // the getText() gets the current value of the text box
                // the toString() converts the value to String data type
                // then assigns it to a variable of type String
                String sUserName = usernameEditText.getText().toString();
                String sPassword = passwordEditText.getText().toString();
                       
                // this just catches the error if the program cant locate the GUI stuff
                if(usernameEditText == null || passwordEditText == null){
                    showAlert("Crap!", "Couldn't find the 'txt_username' or 'txt_password' "
                              + "EditView in main.xml", "Oh shit!", false);
                }else{
                        // display the username and the password in string format
                        showAlert("Logging in", "Username: " + sUserName + "nPassword: " + sPassword , "Ok", true);
                        }
                }
        }
       
        ); // end of launch.setOnclickListener
    }
 
        protected void showAlert(String string, String string2, String string3,
                        boolean b) {
                // TODO Auto-generated method stub
                
        }
 
}
    
    
 
Parsed in 0.039 seconds,  using GeSHi 1.0.8.4

Project Details ::::::

Application Name: Hello Android
Project Name: Hello Android
Package Name: com.hello.android
SDK version : 8 (android 2.2)

Help will be appriciated

alesmana · by **alesmana** » Sun Aug 01, 2010 9:04 am

Sivan wrote:Hi pogz...

Nice tutorial, I really liked it , but there is 1 prob
The layout is perfect but the java coding has a problem

When I run the application on the Emulator, Its running but when i click Login its doing nothing......

Project Details ::::::

Application Name: Hello Android
Project Name: Hello Android
Package Name: com.hello.android
SDK version : 8 (android 2.2)

Help will be appriciated

can you show us your android manifest file

alesmana · by **alesmana** » Sun Aug 01, 2010 10:05 am

Hi pogz,

great tutorial you have here

In any case, I am using android 2.2 and the attached layout xml is no longer work.
Here is mine

[ syntax = "xml" ]
<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:isScrollContainer="true"
android:background="@drawable/foursquare_gradient"
>
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scaleType="centerInside"
android:layout_marginLeft="2dip"
android:layout_marginRight="2dip"
android:layout_weight="1"
android:src="@drawable/main_logo" />
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:layout_marginTop="5dip"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:layout_marginBottom="15dip"
android:padding="10dip"
android:background="@drawable/purple_plate"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingBottom="2dip"
android:textAppearance="@android:style/TextAppearance.Large"
android:textColor="#FFF"
android:text="@string/login_get_started" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingBottom="2dip"
android:textColor="#FFF"
android:text="@string/login_get_started_more" />
<EditText
android:id="@+id/phoneEditText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:textAppearance="@android:style/TextAppearance.Large"
android:hint="@string/phone_number_or_email" />
<EditText
android:id="@+id/passwordEditText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:imeOptions="actionDone"
android:textAppearance="@android:style/TextAppearance.Large"
android:hint="@string/password" />
<Button
android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:enabled="false"
android:textAppearance="@android:style/TextAppearance.Large"
android:text="@string/login_label" />
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:padding="3dip"
android:src="@drawable/line" />
<TextView
android:id="@+id/newAccountTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:paddingBottom="2dip"
android:textAppearance="@android:style/TextAppearance.Large"
android:textColor="#FFF"
android:text="@string/need_an_account" />
</LinearLayout>
</LinearLayout>

[ / syntax ]

And in case someone is wondering what the xml file for the manifest should look like, here is mine
[ syntax = "xml" ]

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="<your package name>"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".<your activty class name>"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>
<uses-sdk android:minSdkVersion="6" />

</manifest>
[ / syntax ]

and in case someone did not read correction made by sainath

sainath wrote:Hi

I am new to Mobile Development and just recently i started playing with Android.

As i was trying this example in android-sdk-windows-1.0_r2.zip, i am getting an error

"The method showAlert(String, String, String, boolean) is undefined for the type new View.OnClickListener(){}"

so i used Toast instead and it worked,

Toast.makeText(LoginPage.this, "Couldn't find the 'txt_username' or 'txt_password'",
Toast.LENGTH_SHORT).show();

but i want to know whether showAlert Exists in present sdk release or it has been removed or its a user defiend function.

thats all

Dhr · by **Dhr** » Thu Aug 19, 2010 12:10 pm

Hello,

Thanks for uploading code for Login Application.

I used it but it shows one error at showAlert();
How to solve it?
Is there any other way to display Alerts in Android.??

I tried to solve the error but after running the application and on clicking the button Login!, it shows nothing.
I mean to say that the Login! button doesn't work.
So how to resolve it.

I m very happy if any one solve it.

Regards/Thanks,
Dhr

anilexotrac · by **anilexotrac** » Thu Dec 16, 2010 7:54 pm

hi,
i am very new to android application.
i have made identical login application with same codings.
but whenever i click ok button, its not showing any message. what may be the cause.

hope to hear soon from you.
thanks

anilexotrac · by **anilexotrac** » Thu Dec 16, 2010 8:46 pm

anilexotrac wrote:hi,
i am very new to android application.
i have made identical login application with same codings.
but whenever i click ok button, its not showing any message. what may be the cause.

hope to hear soon from you.
thanks

wasabi · by **wasabi** » Mon Aug 22, 2011 9:29 am

does the method showAlert exist in the project (PogzTest01.java) or is it just okay to use a Toast insted? thanks

donut · by **donut** » Tue Aug 30, 2011 5:46 pm

if i click login button it doesnt respond anything,,

donut · by **donut** » Wed Aug 31, 2011 8:42 am

Sivan wrote:Hi pogz...

Nice tutorial, I really liked it , but there is 1 prob
The layout is perfect but the java coding has a problem

When I run the application on the Emulator, Its running but when i click Login its doing nothing......

This is your Code:
________________________________________________________________________________________

Syntax: [ Download ] [ Hide ]
Syntax: [ Download ] [ Show ]
Using java Syntax Highlighting

package pogz.test;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

/**

* Application Name: Generic Login Screen for the Android Platform (back end)

* Description: This is a generic login screen which catches the username and password values

* Created on: November 23, 2007

* Created by: Pogz Ortile

* Contact: pogz(at)redhat(dot)polarhome(dot)com

* Notes: The string values for username and password are assigned to sUserName and sPassword respectively

* You are free to distribute, modify, and wreck for all I care. GPL ya!

* */

public class PogzTest01 extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle icicle) {

super.onCreate(icicle);

// load up the layout

setContentView(R.layout.main);

// get the button resource in the xml file and assign it to a local variable of type Button

Button launch = (Button)findViewById(R.id.login_button);

// this is the action listener

launch.setOnClickListener( new OnClickListener()

{

public void onClick(View viewParam)

{

// this gets the resources in the xml file and assigns it to a local variable of type EditText

EditText usernameEditText = (EditText) findViewById(R.id.txt_username);

EditText passwordEditText = (EditText) findViewById(R.id.txt_password);

// the getText() gets the current value of the text box

// the toString() converts the value to String data type

// then assigns it to a variable of type String

String sUserName = usernameEditText.getText().toString();

String sPassword = passwordEditText.getText().toString();

// this just catches the error if the program cant locate the GUI stuff

if(usernameEditText == null || passwordEditText == null){

showAlert("Crap!", "Couldn't find the 'txt_username' or 'txt_password' "

+ "EditView in main.xml", "Oh shit!", false);

}else{

// display the username and the password in string format

showAlert("Logging in", "Username: " + sUserName + "nPassword: " + sPassword , "Ok", true);

}

}

}

); // end of launch.setOnclickListener

}

}

Parsed in 0.042 seconds, using GeSHi 1.0.8.4

__________________________________________________________________________________________________

And this is my code :

Syntax: [ Download ] [ Hide ]
Syntax: [ Download ] [ Show ]
Using java Syntax Highlighting

package com.android.hello;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.os.Bundle;

public class Android extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button launch = (Button)findViewById(R.id.widget33);

// this is the action listener

launch.setOnClickListener( new OnClickListener()

{

public void onClick(View viewParam)

{

// this gets the resources in the xml file and assigns it to a local variable of type EditText

EditText usernameEditText = (EditText) findViewById(R.id.widget29);

EditText passwordEditText = (EditText) findViewById(R.id.widget30);

// the getText() gets the current value of the text box

// the toString() converts the value to String data type

// then assigns it to a variable of type String

String sUserName = usernameEditText.getText().toString();

String sPassword = passwordEditText.getText().toString();

// this just catches the error if the program cant locate the GUI stuff

if(usernameEditText == null || passwordEditText == null){

showAlert("Crap!", "Couldn't find the 'txt_username' or 'txt_password' "

+ "EditView in main.xml", "Oh shit!", false);

}else{

// display the username and the password in string format

showAlert("Logging in", "Username: " + sUserName + "nPassword: " + sPassword , "Ok", true);

}

}

}

); // end of launch.setOnclickListener

}

protected void showAlert(String string, String string2, String string3,

boolean b) {

// TODO Auto-generated method stub

}

}

Parsed in 0.044 seconds, using GeSHi 1.0.8.4

Project Details ::::::

Application Name: Hello Android
Project Name: Hello Android
Package Name: com.hello.android
SDK version : 8 (android 2.2)

Help will be appriciated

donut · by **donut** » Wed Aug 31, 2011 8:43 am

hey i m too facing similar prob as Sivan couuld any1 pls reply me

Building a Generic Login Page

regarding sqlite database

pls check the scenario

i am using min SDK version is 7 and i am using 2.1 api level

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